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Polymers 2018, 10(11), 1231; https://doi.org/10.3390/polym10111231

Polymer Chain Mobility under Shear—A Rheo-NMR Investigation

Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
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Received: 19 October 2018 / Revised: 30 October 2018 / Accepted: 31 October 2018 / Published: 7 November 2018
(This article belongs to the Special Issue Polymer Dynamics)
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Abstract

The local dynamics in polymer melts and the impact of external shear in a Couette geometry have been investigated using rheological nuclear magnetic resonance (NMR). The spin-spin relaxation time, T2, which is sensitive to chain-segment motion, has been measured as a function of shear rate for two samples of poly(dimethylsiloxane). For the low-molecular-weight sample, a mono-exponential decay is observed, which becomes slightly faster with shear, indicating restrictions of the polymer chain motion. For the high-weight sample, a much faster bi-exponential decay is observed, indicative of entanglements. Both components in this decay become longer with shear. This implies that the free polymer segments between entanglements become effectively longer as a result of shear. View Full-Text
Keywords: polymer mobility; rheo NMR; entanglements polymer mobility; rheo NMR; entanglements
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wiesner, B.; Kohn, B.; Mende, M.; Scheler, U. Polymer Chain Mobility under Shear—A Rheo-NMR Investigation. Polymers 2018, 10, 1231.

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